The Research Of Wireless Tire Pressure Monitoring System Power Supply

With the development of modern economy, the development of automobile industry is changing, which need higher request for the safety of the car driving. In a high speeding car, the drivers worry about the tire blowout phenomenon. It is also an important reason for the accident on the highway. So finding tire pressure anomalies in time, and reporting the alarm command are very necessary.Power supply is a key problem in the TPMS technology and only the good power supply can make the device work steady and normally. But the particular working environment of the device limits the power supply. So the traditional active TPMS technology has many problems, passive TPMS is the important direction of the development in the future.A new type of passive TPMS power supply system is adopted. We use the huge inertial energy that the tires have to generate electricity when they are driving in high speed. Firstly, we separate the rotational energy from the tire. Secondly, we use the law of electromagnetic induction to conserve the energy through the closed coils. Lastly, we reach the purpose of collecting electricity.This paper includes two parts. The first part is the theory of simulation through the finite element simulation software. We research the purpose of separating rotational energy by relative motion between tube and solid. We put the permanent magnet, 304 small steel ball with large magnet resistance and lubricating liquid into the closed circular tube. Fluid-solid coupling problems are analyzed by finite element simulation software. The graphite powder is used instead of fluid. Then we analyze that the solid(permanent magnet) go through the closed coils which can produce inductive electromotive force at a certain speed. The second part is building test platform. We observe the experimental phenomena of the fluid-solid coupling model drove under DC motor. By changing the rotation speed and load, we compute the electric power and compare the effect of power generation of the whole experiment.